Cover for fire-extinguishing receptacles.



No. 886,713. I PATENTED MAY 5. 1908.- J. P. MAoWILLIAM.

COVER FOR FIRE BXTINGUISHING REGBPTAOLES.

APPLICATION FILED 1212.13. 1907.

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JAMES 1 MAGWILLIAM, OF l-IUBBARDSTON, MASSAGHUSETTSE COVER FOR FIREEXTINGUISHING RECEPTACLES.

Specification of Letters Patent.

Patented May 5, 1908.

Application filed April 13, 1907. Serial No. 368,107.

To all whom it may concern:

Be it known that I, JAMES F. MAOWIL- LIAM, a citizen of the UnitedStates, residing at Hubbardston, in the county of Worcester and State ofMassachusetts, have invented a new and useful Cover forFire-Extinguishing Receptacles, of which the following is aspecification.

Fire extinguishing receptacles and tanks are ordinarily rovided with acover having a hand-wheel, y means of whichthey can be secured down intoposition and removed. These covers as usually constructed have a surfacewhich is screwed down on packing at the top of the receptacle or tank,and as the surface which bears on the packing neces sarily rotates whilebeing clamped in position, it wears out the packing and is apt to tearit.

The principal object of this invention is to rovide means whereby thisobjectionable eature may be avoided, and that I accomplish by making thecover in two parts, a rin which is provided with screw threads antconnected with the hand-wheel, and a 1plate rotatable with respect tothe ring and aving a surface for engaging the packing. With thisconstruction the turning of the hand wheel to tighten the plate in placedoes not rotate the plate,v and consequently the wearing action on thepacking is avoided.

Reference is to be had to the accom anying drawings, which illustrate are erred form of the invention, and in whic Figure 1 is a side elevationof the upper end of a fire extinguishing receptacle or tank providedwith my improvement. Fig. 2 is a plan of the same. Fig. 3 is a sectionalview on the line 33 of Fig. 2, on an enlarged scale. Fig. 4 is a plan ofa portion of the top of the central plate, and Fig. 5 is a similar viewof a modification.

The receptacle a maybe of the usual construction having an upwardlyextending externally screw-threaded flange a, on the top of which islocated a packing b. On top of this packing is a central plate 0 havinasurface 0 for engaging the packing, pre erably of such size that therubber packing is stretched over it before the plate is applied to thetank. The object of the device is to secure this plate firmly inposition so as to revent leakage without rotating the same. i or thispurpose a ring or shell (1 is employed having a screw threaded flange dfor engaging the screw-threads on the flange a of the ring may be turnedto screw it down in posi-- tion and loosen it from the receptacle. Itwill be observed that the rotation of the ring (Z does not rotate thering 0 but that it is clamped in position against the packing so as tosecurely seal the receptacle or tank.

' In order to insure the non-rotatability of the plate 0 it ispreferably provided with ball-bearings e engagin the ad acent surfacesof the flange d and p ate 0. The balls are mounted in a ball race 0 or(Z (see Fig. 5.) In order that the plate 0 may be connected with thering (1 and hand wheel at all times and lifted with them when removedfrom the receptacle, the plate is provided, with bosses c in which aremounted screws f having means adapted to project over the surface of theflange (Z whereby the parts are held in position when lifted from thereceptacle and when placed on the flange a the rotation of the ring willnot be transmitted to the plate.

While this invention can be carried out in the manner set forth above,there are some ad vantages in embodying it in the form similar to thatshown in Fig. 5. In this case most of the parts are the same as thoseshown above, and are given the same reference letters, but the top ofthe flange a of the tank or receptacle is provided with an annulargroove 0. m which is placed packing 5 The cover 0 is provided with aprojection c which may be circular in form to fit in the groove. In thegroove liquid can be placed before the cover is applied, and then whenthe cover is forced down, a portion of the li uid will be displaced andthe groove fille with it so as to still more effectively seal the joint.In this form also another construction for the ballrace is shown, itbeing indicated as a groove (1 in the flange (1 instead of being locatedin the cover plate.

It will be seen that by the construction of a device in accordance withthe principle set forth, the receptacle can be effectively sealedwithout marring the packing. Moreover, by the use of the ball-bearingsthere will be substantially no friction except that of the screw threadsopposing the rotation of the ring to tighten it or loosen it.

While. I have described. particular forms in which the invention ispreferably embodied, I am aware that many modifications may be madetherein by any person skilled in. the art and it may be applied to otherthan fire ex tinguishing rece tacles without departing from the scope othe invention as expressed in the claims Therefore I do not wish to belimited to the particular features of construction shown, but

What I do claim is 1. In a receptacle cover, the combination of a ringhaving an inwardly extending flange and an opening at the center, asealing plate having its edges projecting under said flange, said coverhaving a circular groove between said plate and flange, hearing ballslocated in said groove, said plate having projections ex tendingupwardly therefrom and enga ing with the inner edge of said flange forguic ing the same, and headed screws mounted in said projections andtheir heads projecting over the top of said ring, whereby said ring andplate are held together, but are rotatably connected.

2. A receptacle cover comprising a ring having an inwardly extendingflange and an opening at. the center thereof, a sealing late having itsedges projecting under said fl ange and rovided with projectionsextending upwar 1y inside said flange and engaging the inner edgeof theflange to guide the same, and fastening devices mounted on saidproections having heads projecting .over the top of said ring, wherebythe rin and plate may be held together and rotatab y connected.

3. In a cover for a fire extinguishing receptacle, the combination of aring having an inwardly extending flange and a vertical flange, asealing plate located under the inwardly extending flange,bearing ballslocated on said plate and engaging the under surface of said flange, andheaded screws mounted in the plate having their heads above saidinwardly extending flange and projecting over it, whereby the plate andring may be connected together.

4. A receptacle cover com rising a ring having a vertical flange bywhlch it is adapted to be secured to a receptacle and an 1nwardlyextending flange, a sealing plate having its edges projecting under saidinwardly extending flange, andheaded screws mounted in said sealingplate having their heads above said inwardly extending flange andprojecting over it for connecting the plate and ring together.

5. A cover for fire extinguishing receptacles, comprising a ring havinga vertical flange by which it is adapted to be secured to thereceptacle, and an inwardly extending flange near the top thereof, asealing plate having its edges projecting under said inwardly extendingflange, and means extending up from said sealing plate and over the topof said flange at a plurality of sides of the sealing plate forconnecting the plate and ring together, whereby the lifting of the ringwill also lift the plate but the ring may be rotated independently ofthe plate.

6. A fire extinguisher, comprising a receptacle having a neck formedwith a seat, a ring-like member adapted to engage said neck having aninwardly extending flange above said seat, and a plate having portionsextending under, and also having means ex tending over, said flange forloosely connecting it with said ring-like member, said plate beingmovable toward and from said seat by turning said ring-like member.

7. In a fire extinguisher, the combination of a receptacle having a neckformed with a seat and with connecting means for a cap or cover, a coverconsisting of a ring-like mem ber having an inwardly extending flangeand also having means for connecting it with said neck, and a platehaving an extension edge which projects beneath the flange on thering-like member and which has a packing ring beneath its extension edgewhich engages the seat on said neck and which also has means at itsedge, above its extension edge overlying the flange on said ring-likemember, whereby said plate may be moved in a vertical direction bothtoward and from its seat by turning said rin like member.

In testimony whereof I ave hereunto set my hand, in the presence of twosubscribing witnesses.

JAMES F. MA-CWILLIAM.

Witnesses:

LOUIS W. SOUTHGATE, ALBERT E. FAY.

